SMDS -
Bellcore , LAN , . 6 (.1-27 ), .1-27b. LAN SMDS .
, SMDS - , .. LAN LAN .
. n , n(n-1)/2 .
45 Mbps.
, MAN, .
.1-28 SMDS . SMDS - .
. IP , IBM ..
, . , , .
.25
, , .25, 70- , .
, . .
.21 , - . . , , . RS-232.
.
, , , ..
.25 128 .
64 Kbps.
.
, .25, - PAD (Packet Assembler Disassembler), . .3, .28 .29.
Frame Relay
(frame relay, FR) - ( ). FR (ISDN - Integrated Services Digital Networks), , FR ( , ). , , , .
|
|
, 1600 . . , , - .
. , . , , . .25 FR .
FR :
Frame Relay Forum (FRF) - , 300 , 3Com, Northern Telecom, Digital, Cisco, Netrix, Ascom Timeplex, Newbridge Networks, Zilog .; American National Standards Institute (ANSI, ); (ITU-T).
( ) , - . . ( FRF) , ANSI, FRF. 1992 . FRF FRF.
FRF (PVC) "-" (UNI). (SVC) . FR. FRF , FR , V.35, G.703, X.21 .